Antimatter supernova
If this is a antimatter star then this might be a light show in few years time.
Last antimatter supernova that exploded was at distance of 7 billion light years.
https://news.nd.edu/news/runaway-anti-matter-production-makes-for-a-spectacular-stellar-explosion/
https://www.universetoday.com/49885/another-antimatter-supernova-discovered/
This also might be a Pair-instability supernova.
https://en.wikipedia.org/wiki/Pair-instability_supernova